package org.opentrafficsim.core.network.factory.xml.units;
   
   import java.util.HashMap;
   import java.util.Map;
   
   import org.djunits.unit.LengthUnit;
   import org.djunits.unit.LinearDensityUnit;
   import org.djunits.unit.UNITS;
   import org.djunits.value.vdouble.scalar.Length;
  import org.djunits.value.vdouble.scalar.LinearDensity;
  import org.opentrafficsim.core.network.NetworkException;
  
  /**
   * Parser for length with unit.
   * <p>
   * Copyright (c) 2013-2019 Delft University of Technology, PO Box 5, 2600 AA, Delft, the Netherlands. All rights reserved. <br>
   * BSD-style license. See <a href="http://opentrafficsim.org/docs/license.html">OpenTrafficSim License</a>.
   * <p>
   * $LastChangedDate: 2015-07-24 02:58:59 +0200 (Fri, 24 Jul 2015) $, @version $Revision: 1147 $, by $Author: averbraeck $,
   * initial version Jul 23, 2015 <br>
   * @author <a href="http://www.tbm.tudelft.nl/averbraeck">Alexander Verbraeck</a>
   */
  public final class LengthUnits implements UNITS
  {
      /** The length units. */
      public static final Map<String, LengthUnit> LENGTH_UNITS = new HashMap<>();
  
      /** The per-length units. */
      public static final Map<String, LinearDensityUnit> PER_LENGTH_UNITS = new HashMap<>();
  
      static
      {
          LENGTH_UNITS.put("mm", MILLIMETER);
          LENGTH_UNITS.put("cm", CENTIMETER);
          LENGTH_UNITS.put("dm", DECIMETER);
          LENGTH_UNITS.put("dam", DEKAMETER);
          LENGTH_UNITS.put("hm", HECTOMETER);
          LENGTH_UNITS.put("m", METER);
          LENGTH_UNITS.put("km", KILOMETER);
          LENGTH_UNITS.put("mi", MILE);
          LENGTH_UNITS.put("y", YARD);
          LENGTH_UNITS.put("ft", FOOT);
  
          PER_LENGTH_UNITS.put("/mm", PER_MILLIMETER);
          PER_LENGTH_UNITS.put("/cm", PER_CENTIMETER);
          PER_LENGTH_UNITS.put("/dm", PER_DECIMETER);
          PER_LENGTH_UNITS.put("/dam", PER_DEKAMETER);
          PER_LENGTH_UNITS.put("/hm", PER_HECTOMETER);
          PER_LENGTH_UNITS.put("/m", PER_METER);
          PER_LENGTH_UNITS.put("/km", PER_KILOMETER);
          PER_LENGTH_UNITS.put("/mi", PER_MILE);
          PER_LENGTH_UNITS.put("/y", PER_YARD);
          PER_LENGTH_UNITS.put("/ft", PER_FOOT);
      }
  
      /** Utility class. */
      private LengthUnits()
      {
          // do not instantiate
      }
  
      /**
       * @param s String; the string to parse
       * @return the unit as a String in the Map.
       * @throws NetworkException when parsing fails
       */
      public static String parseLengthUnit(final String s) throws NetworkException
      {
          String u = null;
          for (String us : LENGTH_UNITS.keySet())
          {
              if (s.toString().contains(us))
              {
                  if (u == null || us.length() > u.length())
                  {
                      u = us;
                  }
              }
          }
          if (u == null)
          {
              throw new NetworkException("Parsing network: cannot instantiate length unit in: " + s);
          }
          return u;
      }
  
      /**
       * @param s String; the string to parse
       * @return the next value.
       * @throws NetworkException when parsing fails
       */
      public static Length parseLength(final String s) throws NetworkException
      {
          String us = parseLengthUnit(s);
          LengthUnit u = LENGTH_UNITS.get(us);
          String sv = s.substring(0, s.indexOf(us));
          try
          {
              double value = Double.parseDouble(sv);
             return new Length(value, u);
         }
         catch (NumberFormatException nfe)
         {
             throw new NetworkException("Parsing network: cannot instantiate scalar: " + s, nfe);
         }
     }
 
     /**
      * @param s String; the string to parse
      * @return the unit as a String in the Map.
      * @throws NetworkException when parsing fails
      */
     public static String parsePerLengthUnit(final String s) throws NetworkException
     {
         String u = null;
         for (String us : PER_LENGTH_UNITS.keySet())
         {
             if (s.toString().contains(us))
             {
                 if (u == null || us.length() > u.length())
                 {
                     u = us;
                 }
             }
         }
         if (u == null)
         {
             throw new NetworkException("Parsing network: cannot instantiate per-length unit in: " + s);
         }
         return u;
     }
 
     /**
      * @param s String; the string to parse
      * @return the next value.
      * @throws NetworkException when parsing fails
      */
     public static LinearDensity parseLinearDensity(final String s) throws NetworkException
     {
         String us = parsePerLengthUnit(s);
         LinearDensityUnit u = PER_LENGTH_UNITS.get(us);
         String sv = s.substring(0, s.indexOf(us));
         try
         {
             double value = Double.parseDouble(sv);
             return new LinearDensity(value, u);
         }
         catch (NumberFormatException nfe)
         {
             throw new NetworkException("Parsing network: cannot instantiate scalar: " + s, nfe);
         }
     }
 
 }